Added handling for scientific notation when there are no decimals

Author: SakiTakamachi

ext/bcmath/libbcmath/src/str2num.c

@@ -222,7 +222,7 @@ bool bc_str2num(bc_num *num, const char *str, const char *end, size_t scale, siz
 
 	/* If a non-digit and non-decimal-point indicator is in the string, i.e. an invalid character */
 	if (UNEXPECTED(!decimal_point && *ptr != '\0')) {
-		goto fail;
+		return bc_scientific_notation_str2num(num, str, end, integer_ptr, fractional_ptr, fractional_end, digits, full_scale);
 	}
 
 	/* search and validate fractional end if exists */
@@ -311,8 +311,4 @@ bool bc_str2num(bc_num *num, const char *str, const char *end, size_t scale, siz
 zero:
 	*num = bc_copy_num(BCG(_zero_));
 	return true;
-
-fail:
-	*num = bc_copy_num(BCG(_zero_));
-	return false;
 }